$r3\:+\:729$
$\lim_{x\to3}\left(\frac{5\left(x-3\right)\sqrt{x+13}}{4-\sqrt{x+13}}\right)$
$\int\left(\frac{xln\left(x^2+1\right)}{x^2+1}\right)dx$
$15x^4-6x^2$
$2\sqrt{-7}\cdot3\sqrt{-28}$
$2^4-4^{-2}$
$\int\left(x^2-5x\right)e^2\:\:dx$
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